Improvement in lamps



D. SYMONDS.

Y Lamp.

No. 46,730. Patented March?, 1865.-

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UNITED STATES PATENT OFFICE.

DEXTER SYMONDS, OF LOWELL, MASSACHUSETTS.

IMPRVEMENT IN LAMPS.

Specification forming part of Letters Patent No. L16.730, dated March 7, 1865.

To a/ZZ whom t may concern:

Beit known that I, DEXTER SYMoNDs, of Lowell, in the county of' Middlesex and State of Massachusetts, have invented a new and mproved Lamp for Burning Coal-Oils and other Similar Hydrocarbons; and I do hereby declare that the following is a full, clear, and exact description thereof, which will enable others skilled in the art to make and use the same, reference bein ghad to the accompanying drawings, forming part of this specification, in which- Figure l is a vertical central section of my invention; Fig. 2, a detached View of the jacket pertaining to the same.

Similar letters of reference indicate like parts.

This invention has2i'or its objcct'the preventing of heat being conducted down to the body of the lamp-from the flame, whereby the uid in the lamp is kept in a comparatively cool state, andthe ame not supplied too copiously with vapor-a contingency which causes the ame to smoke and emit an offensive odor. The lamp is designed for a hand-lamp, and to be used without a chimney.

My invention consists in placing a jacket on the wick-tube of a lamp, a space being allowed between the jacket and wick-tube, and the former insulated from the latter by means of wood or any suitable non-conducting material, the jacket being provided with openings, and all arranged as hereinafter shown and described.

A represents the body of the lamp, and B is a cap or top, which is screwed into the upper end of the lamp, as usual. C is the wicktube, which is of cylindrical form, and fitted in the cap B in the Ordinary manner. D is a jacket of thin sheet metal encompassing the wick-tube G. This jacket is suciently larger in diameter than the wick-tube to admit of an air-space, a, between them, and in the lower end of the jacket there is tted a plug, E, of wood or other non-conducting material, which insulates the jacket from the wick-tube, as shown clearly in Fig. l.

The jacket D extends upward a trifle higher than the wick-tube G, and has openings b b in it to admit a current of air up through the space a, and the upper end of the jacket D spreads the dame, the latter resting on the former.

By this means the ilame is rendered very persistent, and the lamp will admit of being carried about Without danger of the lame being extinguished or being liable to smoke. The insulating of thejacket D from the wicktube prevents the former from conducting heat down to the body of the lamp, the nonconductor E resting on the cap B, so that the metal part of the jacket is not in contact with any part of the lamp. Thus the fluid in the lamp will not be volatilized too rapidly, so as to supply the flame too copiously, and in consequence of the lame not having its heat drawn from it it is also rendered more persistent from that cause. The jacket D being quite thin, it cannot retain and draw heat from the dame sufficiently to injure the plug E.

I claim as new and desire to secure by Letters Patent- The thin metal jacket D, formed with elongated air-openings b b, placed on or around the wick-tube G, and insulated from the latter by means of a non-conducting plug, E, al1 substantially as and for the purpose herein set forth.

j DEXTER sYMoEDs.

Witnesses GEo. P. LAWRENCE, GrEo. STEVENS. 

